Four-side inner-pulling and oblique-ejecting core-pulling mechanism for plastic chair injection mold

Abstract

The utility model provides a kind of four-face inner extraction inclined top core-pulling mechanism of plastic chair injection mold, belong to mould technical field.It includes roof, upper die plate and middle die plate, the middle die plate is equipped with the main forming groove of vertical through arrangement, the upper die plate is equipped with the upper forming surface connected with main forming groove, the upper die plate is also equipped with four chair leg end link forming assembly corresponding with the chair leg forming part of plastic chair, the roof and upper die plate are also equipped with the driving assembly connected with chair leg end link forming assembly.The cooperation of the main forming groove of being equipped with in middle die plate, upper die plate is equipped with chair leg end link forming assembly and driving assembly, realize the synchronous forming of chair leg end link and chair body, driving assembly provides stripping power for link forming assembly, solve the problem that inclined chair leg link is difficult to strip quickly, improve injection molding efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a four-sided inward inclined core-pulling mechanism for injection molds of plastic chairs. Background Technology

[0002] In the existing technology, the legs of one-piece molded plastic chairs need to be fitted with protective sleeves or leg pads to improve wear resistance. Therefore, connecting rods need to be molded at the bottom of the chair legs during injection molding. However, since the chair legs are mostly inclined structures, traditional molds are difficult to achieve smooth demolding of the inclined connecting rods, which can easily lead to demolding jamming or damage to the molded parts, seriously affecting production efficiency and product quality.

[0003] For example, a Chinese patent discloses a stripping mechanism for a plastic chair mold [application number: 200920113299.6], which includes a cavity, a moving mold, and a core. The cavity is formed by the cavity, the moving mold, and the core. A gate and a hot runner are formed in the cavity. A hot runner plate and a hot runner pressure plate are installed at the hot runner opening. A positioning ring is in the hot runner pressure plate. The key feature is that a hydraulic cylinder is installed in the core, an ejector block is installed in the cavity, the oil injection hole of the hydraulic cylinder cooperates with the ejector block, a gate insert is installed in the core, the gate insert cooperates with the hot runner nozzle on an inclined surface, and the ejector block contacts the gate insert. Summary of the Invention

[0004] The purpose of this utility model is to address the above-mentioned problems by providing a four-sided inward inclined core-pulling mechanism for injection molds of plastic chairs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A four-sided inward inclined core-pulling mechanism for a plastic chair injection mold includes a top plate, an upper template, and a middle template. The middle template has a vertically penetrating main forming groove. The upper template has an upper forming surface connected to the main forming groove. The upper template also has four chair leg end connecting rod forming assemblies corresponding to the chair leg forming parts. A drive assembly connected to the chair leg end connecting rod forming assemblies is also provided between the top plate and the upper template.

[0006] In the above-mentioned four-sided inward inclined core-pulling mechanism of the plastic chair injection mold, the end connecting rod forming assembly of the chair leg includes an end connecting rod forming member that is inclinedly arranged in the upper template and whose bottom is flush with the upper forming surface. The bottom of the end connecting rod forming member is provided with an end connecting rod forming groove that is recessed inward. The top of the end connecting rod forming groove is connected to the top plate through an inclined guide sliding pull structure.

[0007] In the above-mentioned four-sided inward inclined core-pulling mechanism of the plastic chair injection mold, the inclination direction of the end connecting rod forming groove is the same as the inclination direction of the corresponding plastic chair leg forming part.

[0008] In the above-mentioned four-sided inclined core-pulling mechanism for plastic chair injection mold, the inclined guide sliding pull structure includes a pull slider set on the top plate. The pull slider is inclinedly provided with a pull groove with a T-shaped cross section. The top of the end connecting rod forming member is inserted into the pull groove and the two sides are symmetrically provided with limiting grooves that are adapted to the pull groove.

[0009] In the above-mentioned four-sided inclined core-pulling mechanism of the plastic chair injection mold, the sliding blocks pass through both sides of the sliding groove.

[0010] In the above-mentioned four-sided inclined core-pulling mechanism of the plastic chair injection mold, the pull-out slider is embedded in the top plate and the bottom of the pull-out slider is flush with the bottom surface of the top plate.

[0011] In the above-mentioned four-sided inclined core-pulling mechanism for plastic chair injection mold, the sliding block is detachably fixed to the bottom of the top plate by several bolts.

[0012] In the above-mentioned four-sided inclined core-pulling mechanism for plastic chair injection mold, the driving component includes two lifting cylinders embedded in the upper template, and the output shaft end of the lifting cylinder is connected to the top plate.

[0013] In the above-mentioned four-sided inward inclined core-pulling mechanism of the plastic chair injection mold, the output shaft of the lifting cylinder is provided with sliding grooves on both sides, and the top plate is provided with U-shaped connecting grooves that can engage with the sliding grooves.

[0014] In the above-mentioned four-sided inclined core-pulling mechanism of the plastic chair injection mold, four guide pillars are fixedly connected to the bottom of the top plate. The guide pillars vertically penetrate the upper template and the middle template and slide in cooperation with the upper template and the middle template.

[0015] Compared with existing technologies, the advantages of this utility model are: 1. By setting a main forming groove in the middle mold and setting a chair leg end connecting rod forming component and a drive component in the upper mold, the chair leg end connecting rod and chair body are formed synchronously. The drive component provides demolding power for the connecting rod forming component, which solves the problem of the inclined chair leg connecting rod being difficult to demold quickly and improves injection molding efficiency.

[0016] 2. The end connecting rod forming assembly of the chair leg adopts an inclined end connecting rod forming member. Its bottom forming groove is flush with the upper forming surface, and the top is connected to the top plate through an inclined guide sliding pull-out structure. This design makes the forming member adapt to the tilt direction of the chair leg. The inclined guide structure provides a directional sliding path for demolding, ensuring that the connecting rod can be smoothly pulled out along the tilt direction after forming, avoiding damage to the formed part during demolding and improving the smoothness of demolding.

[0017] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0018] Figure 1 This is an external structural diagram of the present invention; Figure 2 This is a schematic diagram of the lower part of the structure of this utility model; Figure 3 This is a cross-sectional view of the connecting rod molding assembly at the end of the chair leg; Figure 4 This is a structural diagram of the top of the upper template; Figure 5 This is a structural diagram of the template. Detailed Implementation

[0019] like Figures 1-5 As shown, a four-sided inward inclined core-pulling mechanism for a plastic chair injection mold includes a top plate 1, an upper template 2, and a middle template 3. The middle template 3 has a vertically penetrating main forming groove 4. The upper template 2 has an upper forming surface 5 connected to the main forming groove 4. The upper template 2 also has four chair leg end connecting rod forming assemblies 7 corresponding to the chair leg forming parts 6 of the plastic chair. A drive assembly 8 connected to the chair leg end connecting rod forming assemblies 7 is also provided between the top plate 1 and the upper template 2.

[0020] In this invention, by setting a main forming groove in the middle mold and setting a chair leg end connecting rod forming component and a drive component in the upper mold, the chair leg end connecting rod and the chair body are formed synchronously. The drive component provides demolding power for the connecting rod forming component, which solves the problem of the inclined chair leg connecting rod being difficult to demold quickly and improves the injection molding efficiency.

[0021] Specifically, the chair leg end link forming assembly 7 includes an end link forming rod 9 that is inclinedly disposed within the upper template 2 and whose bottom is flush with the upper forming surface 5. The bottom of the end link forming rod 9 is recessed inwards with an end link forming groove 18, and the top of the end link forming groove 18 is connected to the top plate 1 via an oblique guide sliding pull-out structure 10. The chair leg end link forming assembly uses an inclined end link forming rod, with its bottom forming groove flush with the upper forming surface, and its top connected to the top plate via an oblique guide sliding pull-out structure. This design adapts the forming rod to the tilt direction of the chair leg, and the oblique guide structure provides a directional sliding path for demolding, ensuring that the link can be smoothly pulled out along the tilt direction after forming, avoiding damage to the formed part during demolding and improving demolding smoothness.

[0022] Specifically, the inclination direction of the end link forming groove 18 is the same as the inclination direction of the corresponding plastic chair leg forming part 6. The fact that the end link forming groove and the corresponding plastic chair leg forming part are in the same inclination direction allows the formed link to connect naturally with the chair leg structure, ensuring the consistency of the link forming accuracy with the overall structure of the chair leg, avoiding assembly problems caused by deviation in the inclination direction, and further optimizing the stress state during demolding and reducing demolding resistance.

[0023] Specifically, the oblique guide sliding pull-out structure 10 includes a pull-out slider 11 disposed on the top plate 1. The pull-out slider 11 has an obliquely arranged pull-out groove 12 with a T-shaped cross-section. The top of the end connecting rod forming member 9 is inserted into the pull-out groove 12, and symmetrically arranged on both sides are limiting grooves 13 adapted to the pull-out groove 12. The oblique guide sliding pull-out structure uses the cooperation of the T-shaped pull-out groove and the limiting groove to achieve a precise sliding connection between the end connecting rod forming member and the pull-out slider. The T-shaped structure and the limiting groove form a double guiding limit, preventing the forming member from shifting or shaking during the pull-out process, ensuring a stable demolding trajectory, and improving the forming quality and demolding reliability of the connecting rod.

[0024] Specifically, the pull-out slide 11 passes through both sides of the pull-out slide 12. The pull-out slide 11 passes through both sides of the pull-out slide, which facilitates the installation and disassembly of the end connecting rod forming member. At the same time, it reduces the air resistance in the slide during the sliding process, making the pull-out action smoother, avoiding the jamming problem caused by the slide being closed, reducing the difficulty of mold maintenance, and improving assembly efficiency.

[0025] Specifically, the pull-out slider 11 is embedded in the top plate 1, and the bottom of the pull-out slider 11 is flush with the bottom surface of the top plate 1. The pull-out slider is embedded in the top plate and the bottom of the top plate is flush with the bottom surface of the top plate, so that the slider and the top plate form an integral structure, reducing the space occupied by the mold, while ensuring that the top plate and the upper mold plate fit tightly, avoiding overflow during injection molding, improving the sealing performance of the mold, and ensuring the appearance quality of the molded parts.

[0026] Specifically, the pull-out slider 11 is detachably fixed to the bottom of the top plate 1 by several bolts. The detachable fixing of the pull-out slider by bolts facilitates the replacement and maintenance of the slider. When the slider is worn or needs to be adapted to the molding of different specifications of connecting rods, it can be quickly disassembled and replaced, reducing mold maintenance costs and improving the versatility and service life of the mold.

[0027] Specifically, the drive assembly 8 includes two lifting cylinders 14 embedded in the upper template 2, with the output shaft ends of the lifting cylinders 14 connected to the top plate 1. The drive assembly uses lifting cylinders to drive the top plate, providing stable and controllable power for demolding. The symmetrical arrangement of the two lifting cylinders ensures balanced force on the top plate, avoiding uneven demolding caused by top plate tilting, and realizing synchronous pulling of the connecting rod forming assembly, thus improving demolding efficiency and stability.

[0028] Specifically, the output shaft of the lifting cylinder 14 is provided with sliding grooves 15 on both sides, and the top plate 1 is provided with U-shaped connecting grooves 16 on both sides that can engage with the sliding grooves 15. The sliding grooves of the lifting cylinder output shaft engage with the U-shaped connecting grooves of the top plate to achieve a quick and precise connection between the cylinder and the top plate. At the same time, it plays a guiding and limiting role during the lifting process, preventing the output shaft from sliding relative to the top plate, ensuring stable power transmission, and improving the working reliability of the drive components.

[0029] Specifically, four guide pillars 17 are fixedly connected to the bottom of the top plate 1. The guide pillars 17 vertically penetrate the upper template 2 and the middle template 3 and slide in cooperation with the upper template 2 and the middle template 3. The guide pillars at the bottom of the top plate vertically penetrate the upper template and the middle template, providing precise guidance for the lifting and lowering of the top plate, ensuring that the top plate moves smoothly in the vertical direction under the action of the drive component, avoiding positional deviation of the molding component caused by top plate offset, ensuring synchronous action of each molding part, and further improving demolding accuracy and overall mold working stability.

[0030] The working principle of this utility model is as follows: by setting a main forming groove in the middle mold, setting a chair leg end connecting rod forming component and a drive component in the upper mold, the chair leg end connecting rod and the chair body are formed synchronously. The drive component provides demolding power for the connecting rod forming component, which solves the problem that the inclined chair leg connecting rod is difficult to demold quickly and improves the injection molding efficiency. The end link molding assembly of the chair leg adopts an inclined end link molding member. Its bottom molding groove is flush with the upper molding surface, and the top is connected to the top plate through an inclined guide sliding pull structure. This design makes the molding member match the tilt direction of the chair leg. The inclined guide structure provides a directional sliding path for demolding, ensuring that the link can be smoothly pulled out along the tilt direction after molding, avoiding damage to the molded part during demolding and improving demolding smoothness. The end link molding groove is in the same tilt direction as the corresponding plastic chair leg molding part, so that the molded link and the chair leg structure are naturally connected, ensuring the molding accuracy of the link and the consistency of the overall structure of the chair leg, avoiding assembly problems caused by tilt direction deviation, and further optimizing the stress state during demolding, reducing demolding resistance. The inclined guide sliding pull structure adopts the cooperation of T-shaped pull slide groove and limit groove to achieve precise sliding connection between the end link molding member and the pull slide. The T-shaped structure and the limit groove form a double guide limit to prevent the molding member from shifting or shaking during the pull process, ensuring the stability of the demolding trajectory and improving the molding quality and demolding reliability of the link. The sliding blocks run through both sides of the sliding groove, facilitating the installation and disassembly of the end connecting rod forming component. Simultaneously, it reduces air resistance within the groove during sliding, resulting in smoother pulling action and preventing jamming caused by a closed groove. This reduces mold maintenance difficulty and improves assembly efficiency. The sliding blocks are embedded in the top plate with their bottom flush with the top plate's bottom surface, forming an integral structure with the top plate. This reduces the space occupied by the mold and ensures a tight fit between the top plate and the upper mold plate, preventing overflow during injection molding, improving mold sealing performance, and ensuring the appearance quality of the molded parts. The drive assembly uses lifting cylinders to drive the top plate, providing stable and controllable power for demolding. The two lifting cylinders are symmetrically arranged to ensure balanced force on the top plate, avoiding uneven demolding caused by top plate tilting. This enables synchronous pulling of the connecting rod forming components, improving demolding efficiency and stability. The sliding groove of the lifting cylinder output shaft engages with the U-shaped connecting groove of the top plate, achieving a quick and precise connection between the cylinder and the top plate. At the same time, it plays a guiding and limiting role during the lifting process, preventing relative sliding between the output shaft and the top plate, ensuring stable power transmission, and improving the working reliability of the drive assembly. The guide post at the bottom of the top plate vertically penetrates the upper and middle mold plates, providing precise guidance for the lifting and lowering of the top plate. This ensures that the top plate moves smoothly in the vertical direction under the action of the drive assembly, avoiding positional deviation of the forming components caused by top plate offset, ensuring synchronous action of each forming part, and further improving demolding accuracy and overall mold working stability.

[0031] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A four-sided inward inclined core-pulling mechanism for a plastic chair injection mold, comprising a top plate (1), an upper template (2), and a middle template (3), characterized in that, The middle template (3) is provided with a vertically penetrating main forming groove (4), the upper template (2) is provided with an upper forming surface (5) connected to the main forming groove (4), the upper template (2) is also provided with four chair leg end connecting rod forming assemblies (7) corresponding to the plastic chair leg forming part (6), and the top plate (1) and the upper template (2) are also provided with a drive assembly (8) connected to the chair leg end connecting rod forming assembly (7).

2. The four-sided inward inclined core-pulling mechanism for a plastic chair injection mold according to claim 1, characterized in that, The chair leg end link forming assembly (7) includes an end link forming rod (9) that is inclinedly arranged in the upper template (2) and whose bottom is flush with the upper forming surface (5). The bottom of the end link forming rod (9) is recessed inward and has an end link forming groove (18). The top of the end link forming groove (18) is connected to the top plate (1) through an inclined guide sliding pull structure (10).

3. The four-sided inward inclined core-pulling mechanism for a plastic chair injection mold according to claim 2, characterized in that, The tilting direction of the end connecting rod forming groove (18) is the same as the tilting direction of the corresponding plastic chair leg forming part (6).

4. The four-sided inward inclined core-pulling mechanism for a plastic chair injection mold according to claim 2, characterized in that, The inclined guide sliding pull structure (10) includes a pull slider (11) set on the top plate (1). The pull slider (11) is inclinedly provided with a pull groove (12) with a cross section of T. The top of the end connecting rod forming member (9) is inserted into the pull groove (12) and the two sides are symmetrically provided with limiting grooves (13) that are adapted to the pull groove (12).

5. The four-sided inward inclined core-pulling mechanism for a plastic chair injection mold according to claim 4, characterized in that, The pull-out slide (12) has a pull-out slider (11) running through both sides.

6. The four-sided inward inclined core-pulling mechanism for a plastic chair injection mold according to claim 4, characterized in that, The pull-out slider (11) is embedded in the top plate (1) and the bottom of the pull-out slider (11) is flush with the bottom surface of the top plate (1).

7. The four-sided inward inclined core-pulling mechanism for a plastic chair injection mold according to claim 6, characterized in that, The pull-out slider (11) is detachably fixed to the bottom of the top plate (1) by several bolts.

8. The four-sided inward inclined core-pulling mechanism for a plastic chair injection mold according to claim 4, characterized in that, The drive assembly (8) includes two lifting cylinders (14) embedded in the upper template (2), and the output shaft end of the lifting cylinder (14) is connected to the top plate (1).

9. The four-sided inward inclined core-pulling mechanism for a plastic chair injection mold according to claim 8, characterized in that, The output shaft of the lifting cylinder (14) is provided with sliding grooves (15) on both sides, and the top plate (1) is provided with U-shaped connecting grooves (16) that can be engaged with the sliding grooves (15) on both sides.

10. The four-sided inward inclined core-pulling mechanism for a plastic chair injection mold according to claim 9, characterized in that, The top plate (1) is fixedly connected to four guide columns (17) at the bottom. The guide columns (17) vertically penetrate the upper template (2) and the middle template (3) and slide with the upper template (2) and the middle template (3).

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